After solution treatment,prestrains with 0.05, 01, 0.15 and 0.2 were applied to Ti-2.5 Cu alloy samples followed by first(400 ℃×24 h/AC) and second(475 ℃×8 h/AC) aging treatments and the corresponding tensile and low cycle fatigue(LCF) behaviors were investigated. The results show that the larger Ti_2Cu particles are observed after the second aging compared to the first aging. The yield strength increases with the prestrains for the first aging. Whereas the strength firstly increases with the prestrain while reduction in strength is observed when prestrain exceeds 0.15 for the second aging. Meanwhile, elongation of pretrained and aged Ti-2.5 Cu samples keeps in a same level with those unstrained ones. Considering strain recovery, the strength model of Ti-2.5 Cu alloy with prestrain and aging is established, which is in well agreement with experimental results. LCF results show that the similar LCF life and cycle softening are observed for both aging treatments. The fractography analyses suggest that transgranular fracture with well developed fatigue striations is the predominant failure mode. It can be concluded that the process of prestrain followed by aging is a useful method to obtain good mechanical properties of Ti-2.5 Cu alloy.